From 56f2260008ad5425ec89bfacafe9146422c2c3a7 Mon Sep 17 00:00:00 2001
From: Andrei Mozzhuhin <nopscmn@gmail.com>
Date: Thu, 16 May 2013 11:23:46 +0200
Subject: dosfs: Add statvfs() support

---
 cpukit/libfs/src/dosfs/msdos_statvfs.c | 75 ++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 cpukit/libfs/src/dosfs/msdos_statvfs.c

(limited to 'cpukit/libfs/src/dosfs/msdos_statvfs.c')

diff --git a/cpukit/libfs/src/dosfs/msdos_statvfs.c b/cpukit/libfs/src/dosfs/msdos_statvfs.c
new file mode 100644
index 0000000000..1a1d974fc3
--- /dev/null
+++ b/cpukit/libfs/src/dosfs/msdos_statvfs.c
@@ -0,0 +1,75 @@
+/**
+ * @file msdos_statvfs.c
+ *
+ * @brief Obtain MS-DOS filesystem information
+ * @ingroup libfs_msdos MSDOS FileSystem
+ */
+
+/*
+ *  Copyright (c) 2013 Andrey Mozzhuhin
+ *  Copyright (c) 2013 Vitaly Belov
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+
+#include "fat.h"
+#include "fat_fat_operations.h"
+#include "msdos.h"
+
+int msdos_statvfs(const rtems_filesystem_location_info_t *root_loc,
+    struct statvfs *sb)
+{
+  msdos_fs_info_t *fs_info = root_loc->mt_entry->fs_info;
+  fat_vol_t *vol = &fs_info->fat.vol;
+  rtems_status_code sc = RTEMS_SUCCESSFUL;
+
+  sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT,
+                              MSDOS_VOLUME_SEMAPHORE_TIMEOUT);
+  if (sc != RTEMS_SUCCESSFUL)
+      rtems_set_errno_and_return_minus_one(EIO);
+
+  sb->f_bsize = FAT_SECTOR512_SIZE;
+  sb->f_frsize = vol->bpc;
+  sb->f_blocks = vol->data_cls;
+  sb->f_bfree = 0;
+  sb->f_bavail = 0;
+  sb->f_files = 0;    // FAT doesn't store inodes
+  sb->f_ffree = 0;
+  sb->f_favail = 0;
+  sb->f_flag = 0;
+  sb->f_namemax = MSDOS_NAME_MAX_LNF_LEN;
+
+  if (vol->free_cls == FAT_UNDEFINED_VALUE)
+  {
+    int rc;
+    uint32_t cur_cl = 2;
+    uint32_t value = 0;
+    uint32_t data_cls_val = vol->data_cls + 2;
+
+    for (; cur_cl < data_cls_val; ++cur_cl)
+    {
+      rc = fat_get_fat_cluster(&fs_info->fat, cur_cl, &value);
+      if (rc != RC_OK)
+      {
+        rtems_semaphore_release(fs_info->vol_sema);
+        return rc;
+      }
+
+      if (value == FAT_GENFAT_FREE)
+      {
+        sb->f_bfree++;
+        sb->f_bavail++;
+      }
+    }
+  }
+  else
+  {
+    sb->f_bfree = vol->free_cls;
+    sb->f_bavail = vol->free_cls;
+  }
+
+  rtems_semaphore_release(fs_info->vol_sema);
+  return RC_OK;
+}
-- 
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